Improvement in pulley-shields



I 2Sheets--SheetL B. ALLEN 8|. R. P. MILLER.

Pulley-Shields.

Patented Aug. 4,1874.

INVENTORS 6. 444% 7 K m WITNESSES ZWM ATTORNEYS THE GRAFQIC CO- PHOTO -LITH.3934-E PARK FLACEIMY.

UNITED STATES PATENT OEFIcE.

JOSEPH B. ALLEN AND ROBERT P. MILLER, OF LINEVILLE STATION, PA.

IMPROVEMENT lN PULLEY-SHIELDS.

Specification forming part of Letters Patent No. 153,798, dated August 4, 1874; application filed June 20, 1874.

To all whom it may concern:

Be it known that we, JosEPH BRADFORD ALLEN and ROBERT PATTERSON MILLER, of Lineville Station, in the county of Crawford and State of Pennsylvania, have invented a new and valuable Improvement in Pulley- Shield; and we do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figures 1 and 2 of the drawings are representations of sectional views of our pulleyshield. Fig. 3 is a plan view of the same. Figs. 4 and 5 are detail views of the same.

This invention has relation to means whereby the action of the main driving-belt upon the driving wheel of a stationary engine may be removed therefrom or restored thereto at pleasure, without unship'ping the belt, changing the positions relative to each other of the main driving-wheel and the wheel actuating the mechanism, or causing the main driving-wheel to cease rotating. The novelty consists in a shield applied upon the shaft of a main driving-wheel so that it shall rotate freely thereon, whereby the action of the main driving-belt upon the periphery of the main driving-wheel will be removed when the said shield is caused to beinserted between the .said wheel and its driving-belt, and the said action restored when the said shield is removed from between the belt and the said driving-wheel. It also consists in levers having their fulcrums at each side of the said shield, which will cause a projection upon the shield to become engaged with a hook upon the levers, and cause the said shield to be held from between the belt and wheel, when the ends of the said levers are brought inwardly into contact with each other, whereby the pulley-wheel is allowed to act upon its belt and communicate motion to the actuating wheel of the mechanism, and whereby, when the ends of the said lovers are thrust outward, a projection upon the shield will become engaged with a catch upon the other ends of the lovers, and cause the said shield to be thrust between the driving-wheel and its belt, thereby causing the action of the former upon the latter to be removed, and the mechanism to cease acting, all as will be hereinafter more fully explained.

I11 the annexed drawings, A designates the platform of a stationary engine, upon which are erected standards B, which afford bearings for the shaft 0 of the main driving-wheel D. E designates standards erected upon the platform A, at a suitable distance from the standards B, which afford bearings for the shaft F of an actuating pulley-wheel, G. H designates an endless belt, applied in the usual wellknown manner around the peripheries of the pulley-wheels G and the driving-wheel D, whereby motion communicated to the latter will be given to the former wheel. I designates a segmental guard or shield, which is applied upon the shaft 0 of the main drivingwheel D, so that it will be allowed a free vihorizontal oblong slot, g, in a brace, K, of the standards E, whereby they are prevented from upward displacement. The under surfaces of the lower ends of the levers J are provided with longitudinal grooves c, which are adapted to receive pins d, erected upon a lever, L, by. means of which the levers J are spread apart or approximated. The lever L has a fulcrum upon the foundation A of the engineframe at a point between the levers J, and in line with the driving-wheel D and the actuating-wheel G. k designates a hook, which is erected upon and rigidly secured to each of the levers J at a point between the two shafts O and F, and at a distance from the long axis of the former less than the radius of the shield I, so that when the drivingwheel D is caused to rotate a pin, m, extending out from the shield, will engage the hook it, for a purpose hereinafter to be explained. I designates catches, which are rigidly secured to the upper ends of the levers J at a point outside of the shaft G, and at a distance from the longitudinal axis thereof less than the radius of the shield I.

The main driving-wheel is actuated by any suitable motor applied to its shaft, and it is communicated to the actuating pulley-wheel of the mechanism by means of an endless belt passing around their peripheries; but I may, by means of my improved shield, cause the actuatingpulley to be brought to a standstill,- and again started, without unshippin g the belt or causing the main driving-wheel tdcease rotating, as follows: When the levers J are thrust apart by actuating the lever L, the pulley-wheel 0 being rotated in the mean while, the shield I will be carried over the said pulley-wheel, between it and the belt, by the friction of the belt upon its periphery, and the pin m, becoming engaged with the catch Zupon the levers J, will arrest the said shield in the position shown in Fig. 2, while the main drivin g-wheel will be still rotated, but the actuating-wheel will be brought to a rest, owing to the interposition of the shield I between the said driving-wheel and its belt, whereby the friction of the wheel upon its belt is removed.

When it is desired to actuate the mechanism, I cause the lower ends of the lovers to be from between the belt and driving-wheel, and i the latter will renew its action upon the former, whereby motion will be given to the actuatingwheel of the mechanism.

What we claim as new, and desire to secure by Letters Patent, is

1. The levers J, having hooks 70, catches b, and grooves c, in GOLllblD ation with the pulleyshield I, having pin m, substantially as set forth.

2. The combination, with the lever L, having pins- 11, arranged as described, for actuating the levers J, of the levers J and pulley-shield I, as specified.

In testimony that we claim the above we have hereunto subscribed our names in the presence of two witnesses.

JOSEPH BRADFORD ALLEN.

ROBERT PATTERSON MILLER.

Witnesses JOHN MOEWAN, GEO. Hnenns. 

